Results 81 to 90 of about 216,921 (319)
Rapid Communications in Mass Spectrometry, EarlyView.ABSTRACT Rationale Ions trapped within a Penning cell (ICR) travel periodic orbits whose frequencies are dependent on their mass‐to‐charge ratio and the value of the magnetic field passing through the trap. Fourier transformation (FT‐ICR) decomposes the signal induced in the detection circuit by the rotation of the ions in the cell after the ...
Patrick Arpino, Michel Heninger
wiley +1 more source
Multiple solutions for an indefinite Kirchhoff-type equation with sign-changing potential
Electronic Journal of Differential Equations, 2015 In this article, we study a Kirchhoff-type equation with sign-changing potential on an infinite domain. Using Morse theory and variational methods, we show the existence of two and of infinitely many nontrivial solutions.
Hongliang Liu, Haibo Chen
doaj
Identity Play: Middle School Youths' Provisional Self‐Making in Horizon‐Expanding STEM Spaces
Science Education, EarlyView.ABSTRACT This study introduces identity play as an analytic construct for science education to explore improvisational dimensions of middle school students' STEM identity development in multiple out‐of‐school learning experiences focused on environmental problem‐solving.
Heidi B. Carlone, Alison K. Mercier
wiley +1 more source
Boundary Value Problems, 2018 In this paper, we study a class of biharmonic equations with a singular potential in RN $\mathbb{R}^{N}$. Under appropriate assumptions on the nonlinearity, we establish some existence results via the Morse theory and variational methods.
Chengfang Zhou, Zigen Ouyang
doaj +1 more source
Existing Sustainability Interventions are Insufficient to Scale Up Cocoa Agroforestry in West Africa
Sustainable Development, EarlyView.ABSTRACT Sustainability transitions in agri‐food systems are required to address climate change, biodiversity loss, and social inequities. In the West African cocoa sector, supply chain sustainability initiatives (SSIs) have emerged as key environmental governance tools to address these challenges and promote agroforestry.
Keessy Maria‐Prisca Kouakou +8 more
wiley +1 more source
The $Σ$-invariants of Thompson's group $F$ via Morse theory [PDF]
, 2015 Stefan Witzel, Matthew C. B. Zaremsky
openalex +2 more sources
Thermal Properties and Quantum Information Theory with the Shifted Morse Potential [PDF]
, 2022 Etiufan Udoh +7 more
openalex +1 more source
Morse-Novikov theory, Heegaard splittings and closed orbits of gradient flows
, 2009 The works of Donaldson and Mark make the structure of the Seiberg-Witten invariant of 3-manifolds clear. It corresponds to certain torsion type invariants counting flow lines and closed orbits of a gradient flow of a circle-valued Morse map on a 3 ...
Goda, Hiroshi +2 more
core
Between Strategy and Survival? How Agri‐Food SMEs Navigate Voluntary Sustainability Disclosure
Sustainable Development, EarlyView.ABSTRACT In a context of increasing regulatory pressure and ambiguity around sustainability reporting, this study analyses small and medium enterprises' (SMEs) motivations and challenges in relation to the voluntary adoption of such practices. Using a sector‐based approach, semi‐structured interviews were conducted with 26 agri‐business leaders from ...
Pablo Gomez‐Carrasco +3 more
wiley +1 more source